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  • 1
    Electronic Resource
    Electronic Resource
    Construction of a simple low-field solenoid for the Quantum Design© SQUID magnetometer (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3018-3019 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple copper-wire solenoid is constructed on the exterior of the experimental sample chamber tube of the Quantum Design MPMS© SQUID magnetometer. This copper solenoid can generate fields of less than 20 Oe reproducibly and a field uniformity with less than a 0.1 % variation over a 4-cm length. With the addition of a mu-metal cylinder, zero fields of less than 1 mOe can also be attained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144350
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic field-induced transition in Y1−xGdx (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3415-3417 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic field dependence of the spin structure in single crystals of Y1−xGdx has been studied by neutron diffraction. In zero field, these dilute alloys exhibit long-range helical order with the propagation vector along the c axis and the magnetic moments lying in the basal plane. On applying a magnetic field in the basal plane, the modulation wave vector remains fixed at 0.28c*, and in fields up to 7 T there is no evidence for the development of higher harmonics. The only observed change is a gradual decrease in the magnetic intensity in the satellites. At a higher field Hc which depends on concentration and temperature, there is an abrupt reduction by a factor of 2 in the intensity for reflections along the c* axis, with no corresponding change in the intensity of basal plane reflections. This is consistent with a change in magnetic structure from the helical state to a linear modulated state in which the moments are collinear with the applied field in the basal plane but undergo a sinusoidal modulation along the c axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338738
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous field dependence of the specifc heat in a CoO⋅Al2O3⋅SiO2 spin glass near Tf (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3630-3632 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Precise heat capacity measurements in magnetic fields to 2 T have been performed on a CoO⋅Al2O3⋅SiO2 (40–10–50 mol %) spin glass in the temperature range 2.5–10 K. Analysis of the magnetic field dependence shows that the magnetic specific heat Cm can be expressed as Cm/T=Cm(H=0)/T−bHp at a given temperature T. p(T) shows a broad minimum with values of p ranging from 2 at T(very-much-greater-than)Tf and T(very-much-less-than)Tf to 0.9 as T approaches Tf(≈6 K), while b(T) shows a fairly sharp maximum also centered at Tf. This nonquadratic H behavior suggests that the free energy must contain a term similar to the singular term responsible for the nonlinear susceptibility and that this term also dominates the specific heat as T approaches Tf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338695
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  • 4
    Electronic Resource
    Electronic Resource
    Observation of nonbolometric responses to microwave irradiation on YBaCuO films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7316-7318 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonbolometric response to 8.3-GHz microwave radiation in the resistive transition region of electron-beam-deposited YBaCuO thin films is distinguished from the bolometric response by their different applied microwave power dependence with the nonbolometric effect dominating the voltage response below the boiling temperature of liquid nitrogen. In the presence of a dc magnetic field, the microwave-induced dc voltage in unbiased films shows an oscillatory behavior as a function of microwave power as well as a polarity reversal depending upon the direction of the dc magnetic field. This behavior is consistent with the electromagnetic response arising from the Josephson vortex motion in the junction regions within these granular films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347581
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic phase transition in Y0.97Dy0.03 (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3577-3579 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron diffraction has been used to study the long-range helical magnetic order in a single crystal of the dilute alloy Y0.97Dy0.03. In zero applied magnetic field, the propagation vector is along the c axis and of magnitude 0.28(2π/c), with the magnetic moments lying in the basal plane of the hexagonal lattice. The Dy develops the full free-ion moment and exhibits a temperature dependence similar to that of the Brillouin function for J=15/2. At T=6 K, a magnetic field applied in the basal plane causes almost no shift in the value of the modulation wave vector and as the magnetic field is increased, the peak scattered intensity of the magnetic satellite drops continuously, with the helical phase being completely suppressed in a field of 3 T. On reducing the field, there is hysteresis in the peak intensity, with only 79% of the original intensity being recovered at H=0. This residual intensity grows slowly with time, increasing to approximately 82% of the original value over a period of 1 h. This behavior differs from that of the Y(Gd) system, which shows no hysteresis and displays a sharp transition between helical and sinusoidal phases, the difference presumably being due to the presence of crystal field anisotropy in the case of Dy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340700
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  • 6
    Electronic Resource
    Electronic Resource
    Calorimetric and susceptibility investigations on the MnO⋅Al2O3⋅SiO2 spin-glass system (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3642-3642 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic heat capacity and ac magnetic susceptibility study has been performed on a magnetic ternary glass system—MnO⋅Al2O3⋅SiO2—with Mn concentrations varying from 6 to 19 at. %. At temperatures above 70 K, the susceptibilities follow a Curie–Weiss behavior with negative paramagnetic Curie temperatures and Bohr magneton numbers corresponding nearly to the free ion values of Mn++. However, below 70 K, all glass samples show strong deviations from the Curie–Weiss behavior (a decrease in 1/χ) culminating in spin-glass susceptibility maxima at liquid-helium temperatures for Mn concentrations above 9 at. %. These results suggest a formation of antiferromagnetic clusters which grow in size with decreasing temperature and become "infinitely'' large as the spin-glass freezing temperature is approached. Since the specific heats of glasses do not follow a simple temperature dependence in the temperature range of 1–60 K, calorimetric measurements on several nonmagnetic aluminosilicate glasses were performed in order to accurately determine the magnetic specific heat contribution Cm for the Mn aluminosilicate glasses. A broad maximum in Cm/T is observed in the vicinity of the spin-glass freezing temperature and nonnegligible Cm values are still present at temperatures greater than 50 K (〉10Tf). Only a small fraction of the total magnetic entropy (∼7–8% of cR ln 6) is accounted for between 0 K and Tf, in agreement with the idea that spin-glass ordering in this system is dominated by short-range interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338700
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  • 7
    Electronic Resource
    Electronic Resource
    Spatial and dynamic spin correlation of CuMn (5 at. %) spin glass: Inelastic neutron scattering study (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3401-3403 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron scattering experiments have been performed on a spin-glass CuMn (5 at. %, Tg =27.6 K). Polarized neutron measurements with coarse energy resolution show no change of instantaneous spatial spin correlation below T=60 K. Unpolarized neutron studies with fine energy resolution (ΔE=260 μeV) demonstrate that the slowing down of Mn spin fluctuations occur in the same way for all the wave vectors between 0.2 and 4.0 A(ring)−1. These results indicate that the spatial and dynamic spin correlations are completely decoupled in the spin freezing process. We also study the short-range spatial correlation of the "frozen'' spins at T=5 K using a simple model, and demonstrate the importance of the ferromagnetic coupling between the third nearest-neighbor Mn moments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335108
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  • 8
    Electronic Resource
    Electronic Resource
    Rapid thermal annealing of YBaCuO films on Si and SiO2 substrates (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 153-155 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A very rapid thermal annealing technique has been employed on sputter-deposited YBaCuO films. After an O2 anneal (with or without a N2 preanneal) at temperatures as high as 920 °C for 8–12 s, films on (100)Si and on SiO2 /Si substrates exhibited superconductivity onsets above 95 K and zero resistance in the range 40–66 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100578
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetization studies of near-room-temperature flux-trapping phenomenon in CuO-based materials (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 715-718 
    Details
    ISSN: 1572-9605
    Keywords: CuO-based superconductors ; flux-trapping phenomenon ; near-room-temperature superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract DC magnetization studies on a variety of ceramic and crystalline YBaCuO samples indicate a superconducting-like flux-trappinig behavior occurring at similar temperatures as zero-resistance transition temperatures observed near room temperature. The flux-trapping behavior is exemplified by diamagnetic-like deviations from a positive magnetic background in the zero-field-cooled magnetization, by a divergence between the zero-field-cooled and field-cooled magnetization data, or by a positive Meissner effect in the field-cooled magnetization. These behaviors are consistent with a high-T c (〉250 K) superconducting phase in an inhomogeneous superconductor where the superconducting regions exist as defect structures or surface coatings and whose volume fraction is less than a few percent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00721653
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  • 10
    Electronic Resource
    Electronic Resource
    Paramagnetic meissner effect in conventional Nb superconductors (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 509-514 
    Details
    ISSN: 1573-7357
    Keywords: 74.60.Ec ; 74.25.Ha ; 74.60.Ge ; 74.62.Bf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paramagnetic Meissner effect (PME), in which the field-cooled-magnetization (FCM) of superconducting samples is positive below the superconducting transition temperature Tc, has been observed in certain ceramic and single-crystal samples of the high-Tc cuprate superconductors and more recently in disk-shaped Nb samples. Through systematic investigations of the conditions for observing the PME in Nb disks, various surface treatments to the Nb disks were found to change both the zero-field-cooled-magnetization (ZFCM) and the FCM, including the appearance of a positive FCM in samples previously not exhibiting the PME as well as the elimination of the PME through surface abrasion. These results suggest that the PME arises from the field distributions created by the flux pinning associated with microstructural defects on the surface layer of the disk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768436
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